Compilare: user.cpp: In function ‘int main()’: user.cpp:38:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( i = 0; i < v[x].size(); ++i ){ ^ user.cpp:23:18: warning: unused variable ‘j’ [-Wunused-variable] int n, m, i, j, x, y, c, s, t, d; ^ user.cpp:23:30: warning: unused variable ‘s’ [-Wunused-variable] int n, m, i, j, x, y, c, s, t, d; ^ user.cpp:23:33: warning: unused variable ‘t’ [-Wunused-variable] int n, m, i, j, x, y, c, s, t, d; ^ user.cpp:23:36: warning: unused variable ‘d’ [-Wunused-variable] int n, m, i, j, x, y, c, s, t, d; ^ user.cpp:20:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dijkstra.in","r",stdin); ^ user.cpp:21:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dijkstra.out","w",stdout); ^ user.cpp:25:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:27:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&x,&y,&c); ^