Compilare: main.cpp: In function 'int main()': main.cpp:61:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0 ; j < poz[i].size() ; j ++) ~~^~~~~~~~~~~~~~~ main.cpp:14:42: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("nrsubsecv.in" , "r" , stdin); ^ main.cpp:15:44: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("nrsubsecv.out" , "w" , stdout); ^ main.cpp:16:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d" , &n , &m); ^ main.cpp:21:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d" , &v[i]); ^ main.cpp:71:32: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d" , &a , &b); ^