Compilare: user.cpp: In function ‘int main()’: user.cpp:72:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0; j < v[c].v.size(); j++) ^ user.cpp:85:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0; j < v[pc].t.size(); j++) ^ user.cpp:32:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("alpin.in", "r", stdin); ^ user.cpp:33:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("alpin.out", "w", stdout); ^ user.cpp:34:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:39:37: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%hd", &mat[i][j]); ^