Compilare: user.cpp: In function ‘void solve2()’: user.cpp:38:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(nr.size()<m && k<n) ^ user.cpp:54:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(nr.size()<m) ^ user.cpp:56:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(nr.size();nr.size()<m;k++) ^ user.cpp: In function ‘int main()’: user.cpp:69:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("triunghi5.in","r",stdin); ^ user.cpp:70:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("triunghi5.out","w",stdout); ^ user.cpp:71:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d\n", &v, &n, &m); ^ user.cpp:72:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^ user.cpp:76:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf(" %d", &x); ^