Compilare: user.cpp: In function ‘int Solve2(int, int)’: user.cpp:80:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<V.size();i++) ^ user.cpp:82:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=i+1;j<V.size();j++) ^ user.cpp: In function ‘int main()’: user.cpp:116:54: warning: operation on ‘GroupNumber’ may be undefined [-Wsequence-point] Group[++GroupNumber]=SearchGroup(i,j,GroupNumber); ^ user.cpp: In function ‘void r(int&)’: user.cpp:25:47: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(pos==MAX)fread(f,1,MAX,stdin),pos=0; ^ user.cpp:30:47: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(pos==MAX)fread(f,1,MAX,stdin),pos=0; ^ user.cpp: In function ‘void rch(char&)’: user.cpp:36:43: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(++pos==MAX)fread(f,1,MAX,stdin),pos=0; ^ user.cpp:38:40: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(pos==MAX)fread(f,1,MAX,stdin),pos=0; ^ user.cpp: In function ‘int main()’: user.cpp:100:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("test.in","r",stdin); ^ user.cpp:101:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("test.out","w",stdout); ^ user.cpp:103:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&v,&N,&M); ^ user.cpp: In function ‘int Solve2(int, int)’: user.cpp:95:21: warning: ‘out’ may be used uninitialized in this function [-Wmaybe-uninitialized] MAP[x][y].color=out; ^