Compilare: main.cpp: In function 'int path(int)': main.cpp:13:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int j = 0 ; j < G[u].size() ; j ++ ) { ~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:24:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen( "cuplaj.in", "r", stdin ); ^ main.cpp:25:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen( "cuplaj.out", "w", stdout ); ^ main.cpp:27:32: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf( "%d%d%d", &n, &m, &e ); ^ main.cpp:29:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf( "%d%d", &x, &y ); ^