Compilare: main.cpp: In function 'int main()': main.cpp:43:24: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &t); ^ main.cpp:44:30: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &n, &x); ^ main.cpp:46:42: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &roads[i].distance); ^ main.cpp:48:39: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &roads[i].speed); ^ main.cpp:15:58: warning: 'minTimeSaved' may be used uninitialized in this function [-Wmaybe-uninitialized] return ceil(-0.5 + sqrt(1.0 + 4.0 * (double)distance / minIncrease) / 2); ~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~ main.cpp:40:28: note: 'minTimeSaved' was declared here double left, right, mid, minTimeSaved; ^~~~~~~~~~~~ main.cpp:74:13: warning: 'totalTime' may be used uninitialized in this function [-Wmaybe-uninitialized] totalTime -= minTimeSaved * x; ~~~~~~~~~~^~~~~~~~~~~~~~~~~~~ main.cpp:58:17: warning: 'right' may be used uninitialized in this function [-Wmaybe-uninitialized] mid = (left + right) / 2; ~~~~~~^~~~~~~~