Compilare: main.cpp: In function 'int main()': main.cpp:49:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < buckets[gCost].size(); ++i) { ~~^~~~~~~~~~~~~~~~~~~~~~~ main.cpp:71:12: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses] if (ni == di & nj == dj) { ~~~^~~~~ main.cpp:28:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("padure.in", "r", stdin); ^ main.cpp:29:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("padure.out", "w", stdout); ^ main.cpp:31:56: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d %d %d", &n, &m, &si, &sj, &di, &dj); ^ main.cpp:35:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &a[i][j]); ^