Compilare: user.cpp: In function ‘int main()’: user.cpp:125:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<f[i].size(); j++) ^ user.cpp:133:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<f2[i].size(); j++) ///memset fr ^ user.cpp:139:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(f2[i].size() < k) ^ user.cpp:148:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<f2[temp].size(); i++) ^ user.cpp:104:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zone2.in", "r", stdin); ^ user.cpp:105:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zone2.out", "w", stdout); ^ user.cpp:107:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d\n", &n, &m, &k); ^ user.cpp:109:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s\n", a[i]); ^