Compilare: user.cpp: In function ‘int main()’: user.cpp:22:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0; j < solutions.size(); j++){ ^ user.cpp:38:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(solutions[solutions.size()-1].size() > vecMax){ ^ user.cpp:52:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0; j < solutions.size(); j++) ^ user.cpp:53:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if((solutions[j].size() == sz) && (j != indexBig)){ ^ user.cpp:60:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < solutions[indexVec].size(); i++) ^ user.cpp:8:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("scmax.in", "r", stdin); ^ user.cpp:9:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("scmax.out","w", stdout); ^ user.cpp:11:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld ", &n); ^ user.cpp:13:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld ", &x); ^ user.cpp:18:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld ", &x); ^ user.cpp:53:36: warning: ‘indexBig’ may be used uninitialized in this function [-Wmaybe-uninitialized] if((solutions[j].size() == sz) && (j != indexBig)){ ^ user.cpp:36:56: warning: ‘indexMax’ may be used uninitialized in this function [-Wmaybe-uninitialized] copy(solutions[indexMax].begin(), solutions[indexMax].end(), solutions[solutions.size()-1].begin()); ^