Compilare: main.cpp: In function 'int main()': main.cpp:36:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(sol[i.first].size()>k) sol[i.first].erase(sol[i.first].begin()+k, sol[i.first].end()); ~~~~~~~~~~~~~~~~~~~^~ main.cpp:19:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pitici.in", "r", stdin); ^ main.cpp:20:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pitici.out", "w", stdout); ^ main.cpp:21:24: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(c, 30, stdin); p=-1; ^ main.cpp:25:28: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(c, 30, stdin); p=-1; ^