Compilare: main.cpp: In function 'int main()': main.cpp:36:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(a.size()!=n) ~~~~~~~~^~~ main.cpp:63:4: warning: this 'while' clause does not guard... [-Wmisleading-indentation] while(!a.empty()) ^~~~~ main.cpp:67:5: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'while' for(int i=0; i<m; i++) ^~~ main.cpp:75:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(a.size()!=n) ~~~~~~~~^~~ main.cpp:6:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("blat.in", "r", stdin); ^ main.cpp:7:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("blat.out", "w", stdout); ^