Compilare: main.cpp: In function 'int main()': main.cpp:34:13: warning: unused variable 'r' [-Wunused-variable] int r = v1[i].second.first; ^ main.cpp:35:13: warning: unused variable 'c' [-Wunused-variable] int c = v1[i].second.second; ^ main.cpp:70:24: warning: iteration 510 invokes undefined behavior [-Waggressive-loop-optimizations] holdmin[i] = 510; ~~~~~~~~~~~^~~~~ main.cpp:69:22: note: within this loop for(int i=0;i<=510;i++){ ~^~~~~