picnic.cpp: In function 'void dijkstra(int, int)': picnic.cpp:16: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x picnic.cpp:16: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x picnic.cpp:26: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x picnic.cpp:26: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x picnic.cpp:29: warning: comparison between signed and unsigned integer expressions picnic.cpp: In function 'void verif()': picnic.cpp:46: warning: comparison between signed and unsigned integer expressions picnic.cpp: In function 'void backtrack(int)': picnic.cpp:76: warning: comparison between signed and unsigned integer expressions picnic.cpp: In function 'int main()': picnic.cpp:108: warning: comparison between signed and unsigned integer expressions picnic.cpp:89: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result picnic.cpp:90: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result