104 lines
2.2 KiB
C++
104 lines
2.2 KiB
C++
#include <cstdio>
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#include <cstring>
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#include <algorithm>
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using namespace std;
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const int maxn = 100 + 10;
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bool cmp(char *s, int high, int low, char *sub)
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{
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int j = 0;
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for(int i = high; i <= low; i++) if(s[i] != sub[j++]) return 0;
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return 1;
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}
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int cmpp(char *a, char *b)
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{
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int len_a = strlen(a), len_b = strlen(b), len = min(len_a, len_b), i;
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if(len_a != len_b)
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{
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if(len_a > len_b) return 1;
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else return -1;
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}
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else
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{
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for(i = 0; i < len; i++)
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{
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if(a[i] > b[i]) return 1;
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if(a[i] < b[i]) return -1;
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}
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return 0;
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}
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}
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int to_int(char *s, int high, int low)
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{
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int ret = 0;
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for(int i = high; i <= low; i++) ret = ret*10 + s[i]-'0';
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return ret;
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}
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int main()
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{
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int i, j, k, u, v, cnt = 1, T;
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char a[maxn], b[maxn], B[maxn], c[maxn], minn[maxn];
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scanf("%d", &T);
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while(T--)
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{
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scanf("%s%s", a, b);
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int len_a = strlen(a), len_b = strlen(b);
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for(i = 0; i < maxn; i++) minn[i] = '9';
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for(i = len_b; i < maxn; i++) b[i] = '0'; b[maxn-1] = 0;
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int bb = to_int(b, 0, len_b-1);
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if(len_a < len_b)
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{
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int aa = to_int(a, 0, len_a-1);
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printf("Case #%d: %d\n", cnt++, bb-aa);
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continue;
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}
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bool ok = 0;
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for(i = len_a-len_b; i >= 0; i--)
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{
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int aa = to_int(a, i, i+len_b-1);
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if(aa == bb)
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{
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ok = 1;
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break;
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}
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else
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{
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for(u = 0; u < maxn; u++) B[u] = b[u];
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for(j = len_a-1, k = len_a-1-i; j >= i; j--, k--)
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{
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if(B[k] >= a[j]) c[k] = B[k] - a[j] + '0';
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else
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{
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if(k-1 >= 0) B[k-1]--;
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c[k] = B[k] + 10 - a[j] + '0';
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}
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}
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c[len_a-i] = 0;
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for(v = 0; v < len_a-i; v++) if(c[v] != '0') break;
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if(v != 0) for(u = 0; v <= len_a-i; u++,v++) c[u] = c[v];
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if(cmpp(c, minn) < 0) for(u = 0; u <= len_a-i; u++) minn[u] = c[u];
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}
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}
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if(ok) printf("Case #%d: %d\n", cnt++, 0);
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else
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{
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for(u = 0; u < maxn; u++) B[u] = b[u];
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for(j = len_a-1, k = len_a; j >= 0; j--, k--)
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{
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if(B[k] >= a[j]) c[k] = B[k] - a[j] + '0';
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else
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{
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B[k-1]--;
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c[k] = B[k] + 10 - a[j] + '0';
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}
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}
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c[0] = B[0];
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c[len_a+1] = 0;
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for(v = 0; v < len_a+1; v++) if(c[v] != '0') break;
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if(v != 0) for(u = 0; v <= len_a+1; u++,v++) c[u] = c[v];
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if(cmpp(c, minn) == -1) for(u = 0; u <= len_a+1; u++) minn[u] = c[u];
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printf("Case #%d: %s\n", cnt++, minn);
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}
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}
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return 0;
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}
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