Compilare: main.cpp: In function 'int main()': main.cpp:17:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for(i=2;i<=n;i++) ^~~ main.cpp:19:2: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' for(c.insert(1);!c.empty();) ^~~ main.cpp:14:89: 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),freopen("dijkstra.out","w",stdout),scanf("%d%d",&n,&m); ^ main.cpp:14:89: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] main.cpp:14:89: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] main.cpp:16:43: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&i,&j,&k),a[i].P({j,k}); ^