Compilare: main.cpp: In function 'void Prim(int)': main.cpp:20:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0; i < V[ 1 ].size(); ++i ) { ~~^~~~~~~~~~~~~~~ main.cpp:35:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0; i < V[ x ].size(); ++i ) { ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:61:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0; i < Sol.size(); ++i ) { ~~^~~~~~~~~~~~ main.cpp:50:15: warning: unused variable 'i' [-Wunused-variable] int n, m, i, j, x, y, c; ^ main.cpp:50:18: warning: unused variable 'j' [-Wunused-variable] int n, m, i, j, x, y, c; ^ main.cpp:47:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen( "apm.in", "r", stdin ); ^ main.cpp:48:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen( "apm.out", "w", stdout ); ^ main.cpp:52:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf( "%d%d", &n,&m ); ^ main.cpp:54:36: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf( "%d%d%d", &x,&y,&c ); ^