Compilare: main.cpp: In function 'int main()': main.cpp:54:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=0; k<M.size(); k++) ~^~~~~~~~~ main.cpp:82:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=0; k<M.size(); k++) ~^~~~~~~~~ main.cpp:99:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<M.size(); i++) ~^~~~~~~~~ main.cpp:12:31: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("joc6.in","r",stdin); ^ main.cpp:13:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("joc6.out","w",stdout); ^ main.cpp:15:17: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ main.cpp:18:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&nr); ^ main.cpp:24:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&nr); ^